Recently, it has become necessary to evaluate the resistance properties of rock structures based on dynamic properties. This is due to the Japanese guidelines for seismic evaluation and the design of civil structures have been reviewed in response to the frequent occurrence of large earthquakes in the country. However, few studies have been performed on the dynamic-deformation and damping characteristics of rocks. To clarify the dynamic-deformation characteristics of granite, we performed cyclic uniaxial tests using "JGS0542-2009 Method". The experimental results are as follows: (1) the measured equivalent Young's modulus increases along with strain in the small-(<10 micro-strain) to medium-(10 to 1,000 micro-strain)-strain range; however, the modulus decreases abruptly at the large (>1,000 micro-strain) strain range where the specimen is broken and (2) the evaluated damping ratio is 0% in the small- to medium-strain range; however, it increases abruptly at the medium- to large-strain range.
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